diff .svn/pristine/ca/ca0795b70306f0c036dcfe85786cda89b037c6f0.svn-base @ 926:b73a59a6acbd luisf

Merge from cannam_integration

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/.svn/pristine/ca/ca0795b70306f0c036dcfe85786cda89b037c6f0.svn-base	Fri May 11 16:10:11 2012 +0100
@@ -0,0 +1,97 @@
+# An instance of Plugin is created for each plugin loaded by Rails, and
+# stored in the <tt>Engines.plugins</tt> PluginList 
+# (see Engines::RailsExtensions::RailsInitializer for more details).
+#
+#   Engines.plugins[:plugin_name]
+#
+# Other properties of the Plugin instance can also be set.
+module Engines
+  class Plugin < Rails::Plugin    
+    # Plugins can add paths to this attribute in init.rb if they need
+    # controllers loaded from additional locations. 
+    attr_accessor :controller_paths
+  
+    # The directory in this plugin to mirror into the shared directory
+    # under +public+.
+    #
+    # Defaults to "assets" (see default_public_directory).
+    attr_accessor :public_directory   
+    
+    protected
+      # The default set of code paths which will be added to the routing system
+      def default_controller_paths
+        %w(app/controllers components)
+      end
+
+      # Attempts to detect the directory to use for public files.
+      # If +assets+ exists in the plugin, this will be used. If +assets+ is missing
+      # but +public+ is found, +public+ will be used.
+      def default_public_directory
+        Engines.select_existing_paths(%w(assets public).map { |p| File.join(directory, p) }).first
+      end
+    
+    public
+  
+    def initialize(directory)
+      super directory
+      @controller_paths = default_controller_paths
+      @public_directory = default_public_directory
+    end
+  
+    # Extends the superclass' load method to additionally mirror public assets
+    def load(initializer)
+      return if loaded?
+      super initializer
+      add_plugin_locale_paths
+      Assets.mirror_files_for(self)
+    end    
+  
+    # select those paths that actually exist in the plugin's directory
+    def select_existing_paths(name)
+      Engines.select_existing_paths(self.send(name).map { |p| File.join(directory, p) })
+    end    
+
+    def add_plugin_locale_paths
+      locale_path = File.join(directory, 'locales')
+      return unless File.exists?(locale_path)
+
+      locale_files = Dir[File.join(locale_path, '*.{rb,yml}')]
+      return if locale_files.blank?
+
+      first_app_element = 
+        I18n.load_path.select{ |e| e =~ /^#{ RAILS_ROOT }/ }.reject{ |e| e =~ /^#{ RAILS_ROOT }\/vendor\/plugins/ }.first
+      app_index = I18n.load_path.index(first_app_element) || - 1
+
+      I18n.load_path.insert(app_index, *locale_files)
+    end
+
+    # The path to this plugin's public files
+    def public_asset_directory
+      "#{File.basename(Engines.public_directory)}/#{name}"
+    end
+    
+    # The directory containing this plugin's migrations (<tt>plugin/db/migrate</tt>)
+    def migration_directory
+      File.join(self.directory, 'db', 'migrate')
+    end
+  
+    # Returns the version number of the latest migration for this plugin. Returns
+    # nil if this plugin has no migrations.
+    def latest_migration
+      migrations.last
+    end
+    
+    # Returns the version numbers of all migrations for this plugin.
+    def migrations
+      migrations = Dir[migration_directory+"/*.rb"]
+      migrations.map { |p| File.basename(p).match(/0*(\d+)\_/)[1].to_i }.sort
+    end
+    
+    # Migrate this plugin to the given version. See Engines::Plugin::Migrator for more
+    # information.   
+    def migrate(version = nil)
+      Engines::Plugin::Migrator.migrate_plugin(self, version)
+    end
+  end
+end
+